σ U+03C3,σ GREEK SMALL LETTER SIGMA ←ς [U+03C2] Greek and Coptic τ → [U+03C4]

σ

1. (mathematics, statistics)Standard deviation.
2. (mathematics)Sum ofdivisors.
3. (mathematics)Braid group algebra.
4. (physics, scattering)Cross section.
5. (materials science)Tensilestress.

   Coordinate term:τ(shear stress)

6. (linguistics, phonology)Syllable.
7. (IPA, obsolete) alabializedalveolarfricative: identified as IPA[θʷ] or[sᶲ], equivalent toShona⟨ȿ⟩.

   See also:ƍ

8. (spatial databases) Theselectoperation.
9. (physics) TheStefan-Boltzmann constant.
10. (chemistry) Ashielding constant.

• ϲ(s) —lunate sigma
• ς(s) —word-final position

Derived from itsmajuscule counterpartΣ.

σ• (s) (lowercase,uppercaseΣ)

1. Lower-casesigma (σίγμα), the 18th letter of the ancientGreek alphabet. It represented thevoiceless alveolar fricative/s/. It is preceded byρ and followed byτ.

See alsosigma

• σ΄,͵σ
• с,С(Cyrillic)
• ⲥ,Ⲥ(Coptic)

• (Greek-script letters)Α α,Β β,Γ γ,Δ δ,Ε ε,Ζ ζ,Η η,Θ θ,Ι ι,Κ κ,Λ λ,Μ μ,Ν ν,Ξ ξ,Ο ο,Π π,Ρ ρ,Σ σ ς,Τ τ,Υ υ,Φ φ,Χ χ,Ψ ψ,Ω ω
• (non-Classical letters)Ϝ(W)ϝ(w),Ͷͷ,Ͱ(H)ͱ(h),Ϻ(S)ϻ(s),Ϟϟ,Ϙ(Q)ϙ(q),Ͳ(S)ͳ(s)
• (punctuation)·⸳.;
• (diacritics)᾿῾◌́◌̀῀¨

• ς(s)(only at the end of a word)

σ• (s) (lowercase,uppercaseΣ)

1. Thelower case lettersigma (σίγμα), the 18th letter of the modernGreek alphabet.

• (Greek-script letters)Α α,Β β,Γ γ,Δ δ,Ε ε,Ζ ζ,Η η,Θ θ,Ι ι,Κ κ,Λ λ,Μ μ,Ν ν,Ξ ξ,Ο ο,Π π,Ρ ρ,Σ σ ς,Τ τ,Υ υ,Φ φ,Χ χ,Ψ ψ,Ω ω
• (non-Classical letters)Ϝ(W)ϝ(w),Ͷͷ,Ͱ(H)ͱ(h),Ϻ(S)ϻ(s),Ϟϟ,Ϙ(Q)ϙ(q),Ͳ(S)ͳ(s)
• (punctuation)·⸳.;
• (diacritics)᾿῾◌́◌̀῀¨
• σ΄
• ͵σ

• Character boxes with images
• Greek and Coptic block
• Greek script characters
• Mathematical Alphanumeric Symbols block
• Mathematical notation characters
• Translingual lemmas
• Translingual symbols
• mul:Mathematics
• mul:Statistics
• mul:Physics
• mul:Materials science
• mul:Linguistics
• mul:Phonology
• IPA symbols
• Translingual terms with obsolete senses
• mul:Chemistry
• Ancient Greek lemmas
• Ancient Greek letters
• Greek lemmas
• Greek letters

• Pages with entries
• Pages with 3 entries
• Translingual terms with redundant script codes
• Coptic terms with redundant script codes
• Ancient Greek terms in nonstandard scripts